(countable) A bond of unity or agreement between individuals, united around a commongoal or against a common enemy, such as the unifying principle that defines the labor movement; mutual support within a group.

A long time union member himself, Phil showed solidarity with the picketing grocery store workers by shopping at a competing, unionized store.

(uncountable) Willingness to give psychological and/or material support when another person is in a difficult position or needs affection.

Only the solidarity provided by her siblings allowed Margaret to cope with her mother's harrowing death.

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